Re: [Swig-user] Polymorphism across C++ and Ruby using SWIG

[<koe...@pa...>]

William,

Thanks for the suggestion but I already tried that and it does not work.  The problem seems to be that Ruby creates an instance of a class that inherits from the Ruby Animal class but not from the C++ Animal class.  It may not even have anything to do with directors.

Any help is welcome, thanks for your feedback.

Cheers,

Koen.

>----- Oorspronkelijk bericht -----
>Van
: William S Fulton [mailto:ws...@fu...]
>Verzonden
: vrijdag
, februari
 20, 2009 08:25 PM
>Aan
: koe...@pa...
>CC
: swi...@li...
>Onderwerp
: Re: [Swig-user] Polymorphism across C++ and Ruby using SWIG
>
>koe...@pa... wrote:
>> Hi,
>> 
>> I use SWIG to wrap a Ruby script around a C++ library. In Ruby, I can inherit from a C++ class from the library, and extend it with new functionality in Ruby.  I can create new instances for this new class, but I cannot pass a pointer to such an instance into a C++ function that expects a pointer to the original C++ base class.  I'm guessing that SWIG does not generate vtables ;-)
>> 
>> You can find an example of my problem on stackoverflow (http://stackoverflow.com/questions/549249/polymorphism-across-c-and-ruby-using-swig).  I hope somebody can point me to an elegant solution.
>> 
>
>You havn't turned on directors for the class, replace
>
>%feature("director") Animal::sound;
>
>with
>
>%feature("director") Animal;
>
>That should then give you the behaviour you want?
>
>William
>
>